51316071040 has 128 divisors (see below), whose sum is σ = 132235084800. Its totient is φ = 18930143232.

The previous prime is 51316071031. The next prime is 51316071041. The reversal of 51316071040 is 4017061315.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (51316071041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12336481 + ... + 12340639.

It is an arithmetic number, because the mean of its divisors is an integer number (1033086600).

Almost surely, 2^51316071040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51316071040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66117542400).

51316071040 is an abundant number, since it is smaller than the sum of its proper divisors (80919013760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51316071040 is a wasteful number, since it uses less digits than its factorization.

51316071040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5674 (or 5662 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 51316071040 in words is "fifty-one billion, three hundred sixteen million, seventy-one thousand, forty".